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SubjectRe: [PATCH 2/2] clk: qcom: Add ipq6018 apss clock controller
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Quoting Sivaprakash Murugesan (2020-02-27 01:55:18)
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index 15cdcdc..37e4ce2 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -89,6 +89,14 @@ config APQ_MMCC_8084
> Say Y if you want to support multimedia devices such as display,
> graphics, video encode/decode, camera, etc.
>
> +config IPQ_APSS_6018
> + tristate "IPQ6018 APSS Clock Controller"
> + select IPQ_GCC_6018
> + help
> + Support for APSS clock controller on ipq6018 devices. The
> + APSS clock controller supports frequencies higher than 800Mhz.

supports CPU frequencies? It's not clear what APSS is to a lot of people
out there.

> + Say Y if you want to support higher frequencies on ipq6018 devices.

support CPU frequency scaling on ipq6018?

> +
> config IPQ_GCC_4019
> tristate "IPQ4019 Global Clock Controller"
> help
> diff --git a/drivers/clk/qcom/apss-ipq6018.c b/drivers/clk/qcom/apss-ipq6018.c
> new file mode 100644
> index 0000000..04b8962
> --- /dev/null
> +++ b/drivers/clk/qcom/apss-ipq6018.c
> @@ -0,0 +1,210 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/err.h>
> +#include <linux/platform_device.h>
> +#include <linux/module.h>

> +#include <linux/of.h>
> +#include <linux/of_device.h>

Are these two includes needed at all?

> +#include <linux/clk-provider.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/reset-controller.h>
> +#include <dt-bindings/clock/qcom,apss-ipq6018.h>
> +
> +#include "common.h"
> +#include "clk-regmap.h"
> +#include "clk-pll.h"
> +#include "clk-rcg.h"
> +#include "clk-branch.h"
> +#include "clk-alpha-pll.h"
> +#include "clk-regmap-divider.h"
> +#include "clk-regmap-mux.h"
> +#include "reset.h"
> +
> +#define F(f, s, h, m, n) { (f), (s), (2 * (h) - 1), (m), (n) }

This can be removed. It's common in clk-rcg.h now

> +
> +static struct clk_branch apcs_alias0_core_clk = {
> + .halt_reg = 0x004c,
> + .clkr = {
> + .enable_reg = 0x004c,
> + .enable_mask = BIT(0),
> + .hw.init = &(struct clk_init_data){
> + .name = "apcs_alias0_core_clk",
> + .parent_hws = (const struct clk_hw *[]){
> + &apcs_alias0_clk_src.clkr.hw },
> + .num_parents = 1,
> + .flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,

Please add a comment about why CLK_IS_CRITICAL is here. Presumably in
the case that a cpufreq driver doesn't probe and claim this clk?

> + .ops = &clk_branch2_ops,
> + },
> + },
> +};
> +
> +
[...]
> +
> +static int __init apss_ipq6018_init(void)
> +{
> + return platform_driver_register(&apss_ipq6018_driver);
> +}
> +core_initcall(apss_ipq6018_init);
> +
> +static void __exit apss_ipq6018_exit(void)
> +{
> + platform_driver_unregister(&apss_ipq6018_driver);
> +}
> +module_exit(apss_ipq6018_exit);

Any reason this can't just be module_platform_driver()?

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